import java.util.Scanner;

public class Ex3_11{
	public static void main(String[] args){
		Scanner input = new Scanner(System.in);
		System.out.print("Enter the month and the year: ");
		int month = input.nextInt();
		int year = input.nextInt();
		boolean leap = (year % 4 == 0 && year % 100 != 0 || year % 400 == 0);
		int days = 0;
		switch (month)
		{
			case 1:
			case 3:
			case 5:
			case 7:
			case 8:
			case 10:
			case 12:
				days = 31;
				break;
			case 4:
			case 6:
			case 9:
			case 11:
				days = 30;
				break;
			case 2:
				days = leap ? 28 : 29;
		}

		System.out.printf("This month has %d days.\n", days);
	}
}